使用的是iTextSharp添加PDF水印，由于是接口动态生成PDF，所以采用的是全部是内存流的形式，而且水印是平铺是。iTextSharp版本是5.5。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | /// <summary> /// 添加倾斜水印 /// </summary> /// <param name="pdfStream">pdf文件流</param> /// <param name="waterMarkName">水印字符串</param> /// <param name="width">页面宽度</param> /// <param name="height">页面高度</param> public MemoryStream SetWaterMark(MemoryStream pdfStream, string waterMarkName, float width, float height) { try { int fontSize = 50;//设置字体大小 int span = 40;//设置垂直位移 MemoryStream outStream = new MemoryStream(); PdfReader pdfReader = new PdfReader(pdfStream); PdfStamper pdfStamper = new PdfStamper(pdfReader, outStream); pdfStamper.Writer.CloseStream = false; int total = pdfReader.NumberOfPages + 1; PdfContentByte content; BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\STCAIYUN.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);//华文云彩字体 PdfGState gs = new PdfGState(); gs.FillOpacity = 0.15f;//透明度 int waterMarkNameLenth = waterMarkName.Length; char c; int rise = 0; string spanString = " ";//水平位移 for (int i = 1; i < total; i++) { rise = waterMarkNameLenth * span; content = pdfStamper.GetOverContent(i);//在内容上方加水印 //content = pdfStamper.GetUnderContent(i);//在内容下方加水印 content.SetGState(gs); content.BeginText(); content.SetColorFill(BaseColor.GREEN); content.SetFontAndSize(font, fontSize); int heightNumbert = (int)Math.Ceiling((decimal)height / (decimal)rise);//垂直重复的次数，进一发 int panleWith = (fontSize + span) * waterMarkNameLenth; int widthNumber = (int)Math.Ceiling((decimal)width / (decimal)panleWith);//水平重复次数 // 设置水印文字字体倾斜 开始 for (int w = 0; w < widthNumber; w++) { for (int h = 1; h <= heightNumbert; h++) { int yleng = rise * h; content.SetTextMatrix(w * panleWith, yleng);//x,y设置水印开始的绝对左边，以左下角为x，y轴的起点 for (int k = 0; k < waterMarkNameLenth; k++) { content.SetTextRise(yleng);//指定的y轴值处添加 c = waterMarkName[k]; content.ShowText(c + spanString); yleng -= span; } } } content.EndText(); } if (pdfStamper != null) pdfStamper.Close(); if (pdfReader != null) pdfReader.Close(); return outStream; } catch (Exception ex) { throw ex; } } |
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